1. Hemodynamic response to high- and low-load resistance exercise in patients with coronary artery disease : a randomized, crossover clinical trialTim Kambič, Vedran Hadžić, Mitja Lainščak, 2021, izvirni znanstveni članek Opis: Low-load resistance exercise (LL-RE) is recommended as an adjunct therapy to aerobic exercise during cardiac rehabilitation in patients with coronary artery disease. The safety and hemodynamic response to high-load (HL) RE remain unknown. The aim of this study was to evaluate the hemodynamic response during both HL-RE and LL-RE prior to cardiac rehabilitation. Forty-three patients with coronary artery disease and/or percutaneous coronary intervention performed three sets of leg-press exercise using HL-RE (eight repetitions at the intensity of 80% of one repetition maximum (1-RM)) and LL-RE (16 repetitions at the intensity of 40% 1-RM) in a randomized crossover sequence. Heart rate (HR), systolic blood pressure (SBP), diastolic blood pressure (DBP), and rating of perceived exertion were measured at baseline, after each set of RE and post-exercise. No clinically relevant changes in HR and BP or in patient-reported symptoms were recorded during HL-RE or LL-RE. Compared with baseline, HR and SBP increased during LL-RE (from 66 bpm to 86 bpm, time effect: p < 0.001; from 129 mmHg to 146 mmHg, time effect: p < 0.001) and HL-RE (from 68 bpm to 86 bpm, time effect: p < 0.001; from 130 mmHg to 146 mmHg, time effect: p < 0.001). Compared with HL-RE, the increase in HR was greater after the final set of LL-RE (32% vs. 28%, p = 0.015), without significant differences in SBP and DBP between LL-RE and HL-RE. Rating of perceived exertion was higher after the 1st set of HL-RE compared with LL-RE (median (interquartile range): 6 (5–7) vs. 6 (5–6), p = 0.010). In patients with coronary artery disease, both HL-RE and LL-RE were safe and well-tolerated. Hemodynamic changes were similar and within the physiological response to RE.
Ključne besede: sport, cardiac rehabilitation, resistance training, blood pressure, heart rate
Objavljeno v DKUM: 20.08.2024; Ogledov: 85; Prenosov: 10
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2. The Impact of Cardiorespiratory and Metabolic Parameters on Match Running Performance (MRP) in National-Level Football Players : a multiple regression analysisRadivoje Radaković, Borko Katanić, Mima Stanković, Bojan Mašanović, Suzana Žilič Fišer, 2024, izvirni znanstveni članek Opis: The aim of the study was to examine the association between cardiorespiratory and
metabolic parameters and match running performance (MRP) in highly trained football players. The
sample of participants consisted of 41 national-level football players (aged 23.20 ± 3.40 years, body
height 182.00 ± 5.15 cm, and body mass 76.86 ± 6.06 kg) from the Serbian Super league. For the
purposes of this research, the following measurements were applied. A maximal multistage progressive treadmill test, with a direct measurement of maximal oxygen consumption (VO2max) (using
Fitmate MED, Cosmed, Rome, Italy) was conducted, alongside continuous heart rate monitoring.
Capillary blood samples were taken from the hyperemic area using specific test strips, and, after
sample collection, lactate concentration was immediately determined using a lactate analyzer. MRP
variables were analyzed according to the BioIRC model of motion structure analysis, based on existing
standards for profiling movement intensity. The results of multiple regression analysis indicated
an association between cardiac parameters and total distance (R2 = 54.3%, p = 0.000), high-speed
running (R2 = 46.4%, p = 0.000), and jogging (R2 = 33.6%, p = 0.004). Regression analysis revealed
an association between cardiorespiratory parameters and total distance (R2 = 24.8%, p = 0.014), and
high-speed running (R2 = 20%, p = 0.039). Meanwhile, no association was found between lactate
concentration and running performance. The explanation for these regression analysis results is based
on the observation that functional abilities represent significant potential for expressing movement
performance, a crucial condition for success in football.
Ključne besede: football players, physical performance, cardiovascular endurance, lactate concentration, maximal heart rate, professional soccer players, running performance analysis, VO2max
Objavljeno v DKUM: 01.07.2024; Ogledov: 104; Prenosov: 5
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3. Electrodermal activity and heart rate variability for detection of peripheral abnormalities in type 2diabetes : a reviewMatej Žnidarič, Dominik Škrinjar, Alen Kapel, 2023, izvirni znanstveni članek Opis: Modern medicine exhibits an upward trend towards non-invasive methods for early detection of disease and long-term monitoring of patients’ health. Diabetes mellitus and its complications are a promising area for implementation of new medical diagnostic devices. One of the most serious complications of diabetes is diabetic foot ulcer. The main causes responsible for diabetic foot ulcer are ischemia caused by peripheral artery disease and diabetic neuropathy caused by polyol pathway-induced oxidative stress. Autonomic neuropathy impairs function of sweat glands, which can be measured by electrodermal activity. On the other hand, autonomic neuropathy leads to changes in heart rate variability, which is used to assess autonomic regulation of the sinoatrial node. Both methods are enough sensitive to detect pathological changes caused by autonomic neuropathy and are promising screening methods for early diagnosis of diabetic neuropathy, which could prevent the onset of diabetic ulcer.
Ključne besede: diabetes mellitus, diabetic foot ulcer, autonomic neuropathy, electrodermal activity, heart rate variability
Objavljeno v DKUM: 22.04.2024; Ogledov: 144; Prenosov: 12
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5. Techniques of measuring heart rate in cattleMarjan Janžekovič, Bogomir Muršec, Ignac Janžekovič, 2006, izvirni znanstveni članek Opis: The intensive animal breeding systems can cause severe environment degradation. However, the highly productive animals are extremely sensitive to the environmental changes. The animal welfare can be in direct contradiction with the need for highly intensive and economically successful milk production. The research is aimed at complementing the method of establishing the stress in calves, race heifers, fattened cattle and milk-cows with different body masses. Measuring of heart rate is one of painless measurements of physiological parameters of stress and, from the point of view of animals it has many advantages over the measurements including taking of blood samples. For measuring the heart rate of different categories of cattle without interference into their body we have tested the usefulness of special apparatuses used worldwide by top sportsmen during training for following up, measuring and monitoring the heart rate. These are Polar monitors of the heart rate, made by Finnish company Polar Electro Oy and working wirelessly with ECG precision. The receiver counts the heart rate on the basis of pulse-to-pulse time average algorithms in 5, 15 or 60-second intervals. The computer interface ensures magnetic transfer of measured and saved data on animals into a PC where the analysis of each collected data file follows. The used type of transmitter "Polar sport tester profi" having two electrodes in an air-tight sealed frame has enabled us to obtain a good signal on calves of up to 180 kg body mass. Periodic response in case of young cattle of up to 280 kg body mass has been registered only if electrolyte was added between the animal skin and the feeler. By further modifications and tests of the mentioned apparatuses the expected response has been reached also on adult animals. We found that use of these apparatuses on animals did not have any influence on special animal acting behaviour. The production of milk and meat in herds did not change during the test.
Ključne besede: Polar monitors, modified apparatus, heart rate, cattle, measuring
Objavljeno v DKUM: 12.07.2017; Ogledov: 1476; Prenosov: 105
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6. CIRKADIJSKI DNEVNO-NOČNI BIOLOŠKI RITMI IN VARIABILNOST FREKVENCE SRCAAmela Salkić Rakuša, 2016, diplomsko delo Opis: V diplomskem delu je opisano kaj je variabilnost frekvence srca (HRV). Opisali smo povezavo med HRV in različnimi boleznimi. Ugotovili smo kako se HRV spreminja v dnevno-nočnem času.
Raziskava je vključevala 5 zdravih preiskovancev starih med 21 in 34 let od tega sta bili 2 osebi ženskega spola in 3 moškega. Prostovoljcem smo namestili aparat za 24 urno snemanje EKG-ja (Holter monitor) in posneli 120 ur podatkov oziroma 502.587 utripov srca. S pomočjo metod časovne in frekvenčne domene smo izračunali HRV.
Rezultati so pokazali da preiskovanci, ki so imeli nemiren ali zamaknjen spanec so imeli tudi odstopanja v vrednosti cirkadijskega indeksa. Ugotovili smo tudi, da so bili vzroki za znižane vrednosti standardnega odklona vseh RR intervalov (SDNN) stresne situacije. Potrdili smo, da se ob fizični aktivnosti aktivira simpatično živčevje in zmanjša aktivnost parasimpatičnega živčevja in s tem se tudi poveča srčni utrip. Med počitkom po vadbi se srčni utrip vrne na izhodišče kar je posledica parasimpatične reaktivacije.
Z neinvazivno metodo HRV smo prepoznali dejavnike tveganja za nastanek kariovaskularnih obolenj.
Ključne besede: heart rate, heart rate variability in circadian rhythms.
Objavljeno v DKUM: 10.10.2016; Ogledov: 3282; Prenosov: 179
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